Return-Path: Received: from rly-da06.mx.aol.com (rly-da06.mail.aol.com [172.19.129.80]) by air-da03.mail.aol.com (v125.7) with ESMTP id MAILINDA032-a734b05905c7; Thu, 19 Nov 2009 13:37:32 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-da06.mx.aol.com (v125.7) with ESMTP id MAILRELAYINDA063-a734b05905c7; Thu, 19 Nov 2009 13:37:18 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NBBrQ-00023n-71 for rs_out_1@blacksheep.org; Thu, 19 Nov 2009 18:36:04 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NBBrP-00023e-Mt for rsgb_lf_group@blacksheep.org; Thu, 19 Nov 2009 18:36:03 +0000 Received: from smtp5.freeserve.com ([193.252.22.159]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NBBrO-0001Ot-UX for rsgb_lf_group@blacksheep.org; Thu, 19 Nov 2009 18:36:03 +0000 Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3412.me.freeserve.com (SMTP Server) with ESMTP id 60C9F1C00084 for ; Thu, 19 Nov 2009 19:35:55 +0100 (CET) Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3412.me.freeserve.com (SMTP Server) with ESMTP id 53A061C00085 for ; Thu, 19 Nov 2009 19:35:55 +0100 (CET) Received: from AGB (unknown [91.109.37.171]) by mwinf3412.me.freeserve.com (SMTP Server) with SMTP id ACC8E1C00084 for ; Thu, 19 Nov 2009 19:35:52 +0100 (CET) X-ME-UUID: 20091119183552707.ACC8E1C00084@mwinf3412.me.freeserve.com Message-ID: <955F0C15833A459FA2557314E925534C@AGB> From: "Graham" To: References: <4B0570B4.8040209@telia.com> In-Reply-To: Date: Thu, 19 Nov 2009 18:35:51 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8089.726 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8089.726 X-Karma: unknown: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: WSPR 2.0 is now available Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.1 required=5.0 tests=MISSING_OUTLOOK_NAME autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-AOL-IP: 193.82.116.20 All I asked Joe K1JT , this question a short time ago, below is the reply G .. > Q : Is there a means to > compensate for the sound card sampling rate? , No, but I think an even better feature. The sample rate in WSPR 2.0 will always be 48000 Hz. This will prevent a problem that occurs in a few systems that insist on sampling at 44100 Hz and then resampling (in the driver) to the 12000 Hz requested by WSPR 1.2 ... and doing a *very* poor job of the resampling. -------------------------------------------------- From: "Andy Talbot" Sent: Thursday, November 19, 2009 5:29 PM To: Subject: Re: LF: WSPR 2.0 is now available > > It has a calibration procedure built in, but as far as I can make out, > is aimed at solving frequency offset / tuning errors. I may have > missed something, but there seems to be no facility to calibrate for > soundcard errors in the same way as WSJT does, which can affect symbol > timing . As we found in discussion on theis reflector a year or so > ago. Sample rate timing error is enough to destroy WSPR decoding > even when signals are strong. > > May be wrong, and will go and re read the appendices associated with > calibration, but no mention is made, specifically, of soundcard > sampling rate error - only refrences to frequency error. > FOrtunately, as WSPR is designed around 12000Hz sampling, this is > rarely out by more than a few ppm in most modern cards. See my > Column in the latest RadCom for some soundcard sampling rate > measurements - and how bad some are > > > Andy > www.g4jnt.com > > This email has been scanned for damaging side-effects by the health > and safety police > > > > 2009/11/19 Johan Bodin : >> >> http://physics.princeton.edu/pulsar/K1JT/ >> >> >> 73 >> Johan SM6LKM >> >> >> > >